Benz C280 ovp replaced still wont start

[chuckles]

recently my '94 C280 would stall for no reason, at times i can just be idle at a light and it would stall other times when gasing it would stall as well. To start the car back up it could take up to 3-5mins from locking the car unlocking it, opening the trunk etc...im not sure if this is the process to start it..or just wait it out..h

anyways i replaced the OVP today and the same issue, right off the bat after replacing the OVP the car would not start.

i want to say this was a fuelpump issue but when the car does NOT start, i can turn the radio on there is a digital display but no music...also you cannot roll the windows down, headlights work...but no A/C or windows or moving the seats electronically.

Does anyone know what else could be wrong?

thanks in advance.